package servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import DB.CouchDB;

import com.google.gson.JsonObject;

public class GetUsers extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public GetUsers() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		doPost(request, response);
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		HttpSession session = request.getSession(true);
		
		String groupID = (String) session.getAttribute("group");
		if(groupID == null || groupID.equals("")){
			JsonObject object = new JsonObject();
			object.addProperty("message", "Group should not be empty");
			response.setContentType("application/json");
			PrintWriter out = response.getWriter();
			out.print(object);
			out.flush();
			out.close();
		}else{
			CouchDB db = new CouchDB();
			ArrayList<JsonObject> result = db.selectUsersByGroup(groupID);
			response.setContentType("application/json");
			PrintWriter out = response.getWriter();
			out.print(result);
			out.flush();
			out.close();
		}
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}
